[danans]

I thought so initially too, but during the early hours of the day when the phenomenon occurs, the temperature is nearly always very cool regardless of whether there is fog cover or not - well below the 25°C (77°F) described in that article.

[coder543]

Ambient air temperature is not the same as what a dark surface exposed directly to the sun will be at. The solar panels will be much hotter than the ambient air temperature if they're in direct sunlight.

[Retric]

In full sun panels can get up to ~150f, but they are not going to be that much above 77f ambient at 9AM.

[lgats]

The panels could have a small amount of condensation on them?